Posted by **Justin** on Tuesday, March 9, 2010 at 10:30pm.

An arrow with a mass of 30g is shot straight up to a height of 130m what is the arrow's initial velocity?

- Physics -
**drwls**, Tuesday, March 9, 2010 at 11:25pm
Potential energy at max height = (initial kinetic energy)

m g h = (1/2) m V^2

Cancel the m's and solve for V

- Physics -
**Justin**, Tuesday, March 9, 2010 at 11:32pm
ok thanks that is what i thought it might be but i just wanted to make sure. I also have another problem that i am hoping that you could help me with. A car requires 30 horsepower to move at a constant 20m/s what is the amount of friction that is needed to overcome?

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